Enameling-powder sifter.



W. LINDSAY. I ENAMBLING POWDER SIFTER. APPLICATION FILED 1530.3. 1908.

Patented Mar. s, 1910.

UNITED STATES PATENT 1 onirica.

WILLIAM LINnsAY, orl cHIcAeo, ILLINOIS., AssIGNoR ro L. woLrr MANUFACTURING COMPANY, or CHICAGO, ILLINOIS, A conronA'rIoN or ILLINOIS.

ENAMELING-POWDER SITER.

Speeication of Letters Patent.

Patented Mar. s, 1910.

To all whom it may concern:

Be it knownthat I, WILLIAM LINDSAY, a citizen of the United States, residing in Chicago, in the county of Cook and State of Illinois, have invented `a newr and useful Improvement in Enameling-Powder Sifters, of which the following is a specification.

My invention relates to sifters or dredgrs l which will be light in weight so that it can be easily held in .the hand and moved about over the heated bath tub or other vessel to be enameled, `and which will operate to evenly and uniformly sift and distribute the enamelmg powder or material as the Workman holds 1t in his hands and moves it about over different portions of the tub or vessel.

I haveldiscovered and herein m invention -conslsts, that `by simplyrigid ysecuring to the handleof the ordinary handv ya speed ofapproximate y two thousand revolutions per minute, and the shaft of which is furnished with an eccentric weight, the

powder inthe dredge'r or sieve will be caused 1' to evenly sift through the same and be uniformly and equally distributed; the mechanism of my invention being a practical embodiment and utilization of the hysical law or principle that where two bo ies, free in space, are mounted, the one to rotate upon trie tothe center of gravity of the rotating body, it tends to produce a like circulatory movement of the center of gravity of the two bodies; thus causing each and every point of the sieve` or dredger screen to rapidly describe a series of minute circular movements of extremely 4small diameter; which I find to be sufficient to cause the powdered enameling material to sift at an absolutely uniform rate through the screen. In the accompanying drawing forming a f part of-this specification, Figure l is a sidel elevation of an enamelm'g powder sifter `embodying my invention. Fig. 2 is an enlarged sectional view of the sieve or dredger. Fig. 3 is a plan view of the sieve or dredger. Fig. 4 is a section on line 4-4 of Fig. l. Fig. 5 is a detail plan view and Fig. 6 is a sectionv on lineA 6 6 of Fig. 1. Fig. 7 shows a modification. e

In the drawing7 1 represents a sieve or dredger such as is commonly used for siftin owdered' enameling material over heate bath tubs and other like articles while the same are atahigh heat. e 2 is the handle of the sieve or dredger, the same being preferably about four and one half feet m length and. made of wood or metal, hollow or solid as may be preferred. The sieve 1 and .handle 2 are or may be of the same identical construction as are ordinarily employed in hand dredging.

3 is a light electricl motor of any suitable kind or construction, It preferably has an aluminum caseor shell 4- which .may be of any shape, butv preferably globular. By making the metalcase ofthe electric motor of. aluminum it will be materially lighter than if madeof other metal and thus add somewhat to the convenience of manually holding it when attached to the handle of the sieve. The case il of the electric motor g may be attached or secured to the dredger handle in any suitable way, but preferabli' by a bracket' connected by screws (3 with the electric motor shell and by screws or lthe other and about a center which is eccenrivets T with the handle of the dredger. The armature .shaft- S ofthe electric motor is provided with va small eccentric weight or disk 9 rigidly secured thereto and adapted to be rotated by the electric motor.

T o clearly indicate that the center of f gravity of the weight is eccentric to the motor shaft, I have represented the weight as 'revolutions per minute andl the eccentric aveight ei'n'ployed is prc'terably alunitiliree' oi' four ounccs. o l y Current is supplied to the electric motor through llexible conductor Wires inclosed in thetlcxible insulating cord 10 leading from4 .the electric supply Wire to thel motor; so

that the'dredger may be manually held and manually moved about. :is required iii distributing the enaineling material being site ed therefrom over'diifereiit parte of the bath i ub or `other vessel to' he enameled. rIhe electric motor is of course provided with thc customary switch ll for shutting on or -oft' the current; This switch ll may preferably` have an arm or thumb piece 'lf2 adjacent to the handle 2 so thaty it may be operatedby the thumb or linger of the hand which grasps the handle of the dredger.

'The' electric inotor is preferably so attaclied to the handle. 2 that the inotor shaft 8 extends a'tright angles to the vhandle and so' that thc eccentric -iveiglit revolves in a plane parallel to the screen .t3 of the sieve. [n prac-,tical operation, I find it desirable t0 employ a screen `of considerably finer mesh than that? ordinarily heretofore employed iii sieves for sifting or dredging enaineling niatei'i'a'l on 4hath tubs, the mesh heretofore generally employed being ordinarily about lorty mesh, while Vthat which l employ in my invention is preferably about fifty mesh. 'lhe liner niesh is desirable in my invention, as with a `ct'iarsei' niesli the enameliiig powder would sift tco rapidly through the screen, owing to the vrapidity with iyliich' each ploiiit of the screen rotates or nieves in a Circe of extremely small diameter under the influence of the rapidly revolvingl eccentric weight driven by the motor.

While the single rigid body, consisting olfthe sieve, the handle attached thereto and 4the motor attached to the handle, is a body which is held and supported in tlieha'iids of the \\'orkinan, and consequently in one sense not a body entirely free in sl'iace to circulate about the common center of gravityl olY said body and of the revolving eccentric weight., still, owing to the great .rapidity of the revolution of the eccentric weight and of the extremely small diameter of the circle lulrich each point of the other body (sieve, handle and motor) tends to describe under the pliysieahlan' or principle lierciiil'ieforc mentioned, the energy of the Workman whose hands grasp the handle is practically a neglegible factor or quantity in actualV operation so far as tending to prevent or neutralize the rapid circulatory movement in circles of very minute diameter of each point of the sieve and the resultantV efficient sift-ing action.

For convenience in manually holdin and siqipoitiiig the sifter as a whole, I pre er to attach the electric motor near the outer end,

o'l the handle, as itthus in a measure tends to couut'erbalaiice the Weight of the sieve and its contents and renders the device more iiiaii who holdsI the'device in his hands during the sifting operation; and in this respect also, as ivell. as iii respect to much more regular and efficient operation, my device -possesses advantages over those heretofore in use.

For convenience in handling and manipulation, I prefer to rigidly attach the electric motor by a.coiinecting bracket or member to the handle of the sieve; but if the screws 7 by which the bracket or member -5 is at taclied to the handle, are, for example, omitted and the handle member or bracket 5 extended somewhat in length so that both it and the sieve 'handle 2 may bel conveniently grasped and held bythe hands, as shown in Fig. 7, the device will operate the same; although the sieve handle and motor are entirely separate and disconnected instrumentalities. I, however, prefer, as before stated,

'to practice my invention in the fornifirst vdescribed or wherein the manually held sieve,

and the manually held electric motor are `rigidly connected together, there thus being biit-tlie one instrumentality to be aspe by the Workman in his hands or ot erwise handled or supported'and movedabout.

tributiiig eiiameling powder, the combination of a sieve, a handle rigid therewith ioo l f 115 '1. In a li'anddre'dger for sifting and .dis-

whereby the device may be manually held luble in a plane parallel with the sieve, sob# and moved from place to place, a small and stantially as set forth. light electrclnotorvmounted on the handle l and fixed thereto and having a 'shaft ar- A WILLIAM LINDSAY' ranged transverse to the handle, and a Witnesses: weight mounted' eccentrically on the said `PEARL ABRAMS,

shaft, the Weight being arranged and revo- WILLIAM A. GEIGER. 

